In some instances, its also used to insulate electrical cables and wires. E-mail addresses: ajwhelton@gmail.com, awhelton@purdue.edu(A.J. Six brands of PEX pipes sold in the USA and a PEX-a green building plumbing system impacted chemical and drinking water odor quality. When chlorine reacted with chemicals leached by the plastic pipes, odor levels for one brand of PEX pipe tripled. The level of solvent, however, does not exceed health standards. As TOC decreased, the ultraviolet absorbance at 254 nm increased. : 1 765 496 3996. In particular, you should look for copper pipes that have lead-free joint materials. Water chemical and odor quality was monitored for new PEX-a, -b and -c pipes with (2 mg/L free chlorine) and without disinfectant over 30 days. Some testing results were published online in September in the journal Water Research. Otherwise, the acidity of the water could cause the copper to corrode. The U.S. EPA's maximum drinking water odor limit is a "threshold odor number" of 3, or 3 TON. CPVC is made through CPVC resin into a pipe shape using high temperatures and pressure. Toluene, a solvent used for plastic resin synthesis, often causes odors that reach a detectable level. Tel. Copper pipes have withstood the test of time for over 75 years, but this doesnt mean that theyre the best alternative to PEX piping. PEX is also more flexible than PVC, making it a good substitute.. In addition, you might want to consider flushing your piping system regularly. Water is one of the most important resources on planet Earth, especially drinking water. A major pro to PVC piping is that its safe to use outdoors, so long as its coated with water-based paint when exposed to sunlight. Also known as polyvinyl chloride, this thermoplastic is designed for household plumbing. You also dont have to worry about plastic-based pipes breaking down when exposed to moisture, unlike a polybutylene pipe., PVC pipes are the most well-known plastic pipe, but it has some major drawbacks. Researchers are examining the extent of PEX pipes impact on water quality, testing various brands of plastic pipes. This combination is very long-lasting and durable. High-density polyethylene pipes are one of the toughest pipe materials available on the market. An equal access/equal opportunity university. Avoid drinking water from the tap for the first 30 days after installation, Filter your drinking and cooking water with. A 2012 comparison showed PEX pipe was the least expensive among plastic pipes, costing 43 cents per foot compared to the most expensive metal, copper pipe, at $2.55 per foot. Even a three-day vacation without using your taps can cause a chemical build-up in the water. HDPE pipes are also considered leak-proof when taken care of. Sixteen organic chemicals were identified, including toluene, pyridine, methylene trichloroacetate and 2,4-di-tert-butylphenol. This means that, compared to PVC, CPVC piping is more resistant to temperature changes; it can sustain temperatures of up to 200 degrees Fahrenheit. PEX is cross-linked polyethylene. PEX piping is a cross-linked polyethylene piping commonly used in home plumbing systems for heating, cooling, and water systems. The Water Research paper was authored by University of South Alabama graduate student Keven M. Kelley; associate professor Alexandra C. Stenson and assistant professor Rajarashi Dey at the University of South Alabama; and Whelton, a former faculty member at the University of South Alabama. Theyre very durable and wont corrode easily. Until researchers have definitive answers, California urges homeowners with existing PEX piping tofilter drinking waterfrom the tap to ensure no issues with the quality of water coming from PEX water pipes. The researchers found ETBE drinking water levels as high as 175 parts per billion (ppb) during the first three days of PEX pipe use and then 74 ppb after 30 days of use when the testing ended. Chlorinated polyvinyl chloride (CPVC) is closely related to PVC, except its made out of chlorinated PVC resin. Lic #: CT-34954, When building a house, planning out your plumbing system requires as much attention as the siding, the color of your walls, or the layout of your rooms. There are many options on the market for pipes in your home. If your water supply has a pH level of less than 7, PEX pipes may be a good plumbing solution. The temperature resistance comes at a price, though. A general assumption in the United States is that chemicals responsible for drinking water odors pose no health dangers. There are many options on the market for pipes in your home. However, no federal drinking water standard exists, Whelton said. Access to running water allows us to cook our food, clean dishes, wash ourselves, and most importantly drink water.. Polybutylene pipes were very common in the 70s through the 90s since theyre a low-cost material. Not so fast. You should avoid using PVC pipes for your main drinking water.. Please contact us at online@purdue.edu so we can help. On the downside, PVC is more likely to leak or crack during a freeze. Life on Earth cannot survive without water. Since there is so little research data on these pipes safety, some contractors hesitate to use PEX piping until they know more about its long-term impact. Department of Civil Engineering, 550 Stadium Mall Drive West Lafayette, IN 47907, USA. Like the others we mentioned above, HDPE does not corrode with acidic water. Consider the advantages and disadvantages of PEX vs. copper piping when installing or replacing pipes in your home. The testing revealed the presence of 11 chemicals that were PEX pipe ingredients and ingredient degradation products. Trouble with this page? Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, (765) 494-4600, 2014-18 Purdue University | An equal access/equal opportunity university | Integrity Statement | Copyright Complaints| Brand Toolkit | Maintained by Marketing and Media. Need professional help with your project? Copper pipes are also very expensive. However, some installers have more experience and trust in installing traditional copper piping. This type of piping is the least expensive among plastic pipes, costing just $0.45 per foot compared to the most expensive metalcopper pipeat $2.55 per foot. Another alternative to PEX pipes and copper pipes is PVC. However, they break down very easily and need to be replaced nearly every decade. Corinne Segura | My Chemical-Free House Consulting, How High Performance can Help Prevent Mold, Traveling with Environmental Sensitivities, The Locations Effect Canadian Locations, The Locations Effect Caribbean Campsites, Interview: Healing MCS with Mold Avoidance. Enter a zip below and get matched to top-rated pros near you. He will detail research findings in a presentation during the 2014 U.S. Green Building Councils Greenbuild International Conference & Exposition on Friday (Oct. 24) in New Orleans with Rebecca Bryant, managing principal of Watershed LLC of Fairhope, Alabama. PEX piping is still relatively new in the United States. Compliance is voluntary because the standard is based on aesthetic - not health - considerations. One of the most recent studies, conducted in 2021, tested water from eight different types of PEX pipe brands. This is because any contamination that may occur builds up as water stays stagnant in the piping. Your email address will not be published. If youre concerned about existing PEX pipes in your home and want to replace them, or if youve changed your mind about purchasing PEX pipes, there are a handful of alternatives. But as more consumers turn to PEX piping for its affordability and ease of use, its unclear whether PEX tubing may negatively impact water quality. Cold weather can wear out your PEX piping, but a few simple precautions can prevent major issues, Visit the Solution Center to Explore Articles. Keep reading below as we explain which pipe material is the safest for drinking water and some pipe materials you should avoid! Save my name, email, and website in this browser for the next time I comment. Eleven PEX-related contaminants were found in the plumbing system; one regulated (toluene) and several unregulated: Antioxidant degradation products, resin solvents, initiator degradation products, or manufacturing aides. In other words, chemicals might get leached through your PEX pipes, and these chemicals may be toxicological to some extent. Every new home, shop, or office building needs some sort of plumbing, including piping, water heaters, fixtures, garbage disposals, and more. In the September study, drinking water was tested from a PEX plumbing system in a net-zero energy building in Maryland six months after the system had been installed. Copper pipes can last up to 100 years with proper care. PEX is very resistant to acidic water. "A contractor who installed PEX in parts of a million-dollar home in Oklahoma asked us for help because the homeowners reported gasoline-like odors in a bathroom's tap water," Whelton said. PEX pipes make it easy for plumbing novices to DIY their whole system. These include crosslinked polyethylene (PEX), high-density polyethylene (HDPE), polyvinylchloride (PVC), chlorinated PVC (cPVC) and polypropylene (PP) pipes, said Andrew Whelton, an assistant professor in Purdue University's Lyles School of Civil Engineering and Division of Environmental and Ecological Engineering. If you wish to use PVC piping for hot water, youll need to opt for CPVC. * Corresponding author. In fact, there are over 70 PEX pipe brands on the market, and studies showed that some of those PEX pipes have over 150 contaminants. You can identify PEX pipes by the trademark red and blue colors most commonly found inside your homes walls. This may lead you to wonder what is the safest pipe for drinking water. Youll have to pay six times as much for this option compared to PVC. document.write(new Date().getFullYear()); If the copper pipes corrode into your drinking water, it can cause stomach problems.. Odor and chemical levels were monitored with and without chlorine treatment over a 30-day period for the six pipe brands. Since HDPE pipes have a smooth interior, they can improve water pressure since they create little to no friction on the water. Generally, these pipes wouldnt be a safe option in a cold climate. They found that 62 chemicals leached into the water, with half of those organic compounds leached considered toxicological but not carcinogenic. Installers can effortlessly bend and cut the pipe to fit the tight spaces in your home. Although, several chemicals found in the plumbing research have regulated health limits, and one PEX pipe brand caused drinking water to exceed the ethyl-tert-butyl ether (ETBE) drinking water health standard. You can also recycle PVC piping, making it relatively more environmentally friendly. Its rather inexpensive, especially in comparison to copper. This may lead you to wonder what is the, It may come as a surprise but copper is one of the best materials for pipes when it comes to clean drinking water. When building a house, planning out your plumbing system requires as much attention as the siding, the color of your walls, or the layout of your rooms. There, the researchers describe drinking water impacts caused by six brands of PEX pipes available in the United States. The state still has concerns regarding the safety of PEX pipes and has implemented provisions to protect residents from potential issues. (Purdue University photo/John Underwood) Download Photo. Our own bodies are 70% water, as is the earth itself. The team plans to continue the work and release additional results from the study over the next several months. It may come as a surprise but copper is one of the best materials for pipes when it comes to clean drinking water. Free chlorine caused odor levels for PEX-a1 pipe to increase from 26 to 75 threshold odor number (TON) on day 3 and affected the rate at which TOC changed for each brand over 30 days. While PEX plumbing may leach contaminants into your homes tap water, limited research suggests its still safe to use. PEX vs. Copper Piping: Which Is Better for Your Home? Thats why one of the most important utilities in our home is running water. Overall, PEX pipes are more sustainable, affordable, and long-lasting, while copper pipes are more prone to corrosion and small leaks that are more costly to replace. The presence of drinking water odor can prompt homeowners to avoid their drinking water altogether. Odor and total organic carbon (TOC) levels decreased for all pipes, but odor remained greater than the USA's Environmental Protection Agency's (USEPA) secondary maximum contaminant level. Neither toluene nor ETBE exceeded health standards, however. If you install copper pipes in your home, test the waters acidity regularly and see if there are any copper contaminants in your drinking water. Thousands of dollars can be saved during construction by installing plastic instead of metal plumbing systems, and proponents assert plastic pipes require less energy to manufacture - generating less carbon dioxide compared to metal pipes - ostensibly making them a good fit for green buildings. But you must check your waters pH level in the very beginning. Generally more affordable, lighter, and easier to install than metal plumbing, PEX pipes are the perfect choice for your home, right? The work is funded by an NSF grant entitled "Towards a Safer and Greener Indoor Environment: Chemical Liberation from Polyethylene Plumbing Pipe. Little is known about the degree to which plastic pipes sold in the U.S. affect drinking water quality, Whelton said. So, while the gasoline-smelling water may cause homeowners to wrinkle their noses, its generally safe to use. When establishing the ETBE limit in New Hampshire, public health officials specifically added a 10-fold reduction to allow for its suspected carcinogenic potential. Pipes consumed as much as 0.5 mg/L as Cl2 during each 3-day stagnation period. Some were also detected during the plumbing system field investigation. Everything You Need to Know About PEX Pipe. Yet, in our beautiful home of Hawaii, CPVC, and PEX pipes can last a very long time without any issues. Because it requires less energy to produce than metal pipes, it's become more common in homes and green building construction. This option can also withstand UV rays and may be more appropriate for hotter climates where the sun might pose a threat to piping and freezing is rare. 535 Plumbing LLC. A few problems you might experience from your PEX pipes include: Drinking water odors, such as that of gasoline, that might prompt you to avoid your water altogether, Poorer water quality from toxic chemicals and contaminants leaching into your water, Some leached chemicals may encourage bacteria growth in the pipes, Exposed PEX pipes that are vulnerable to UV rays and damage from cold climates and must be kept indoors, underground, or in the walls of your home. CPVC pipes are perfect for transporting water from the municipal system and throughout your home. WEST LAFAYETTE, Ind. For one, youll need to replace them more frequently; PEX piping can expand during cold weather, making it more suitable for places where winterization is necessary. Disability-related accessibility issue? If that pipe transports water as hot as 140 *F, it can warp and break down. Andrew Whelton, an assistant professor in Purdue's Lyles School of Civil Engineering and Division of Environmental and Ecological Engineering, is leading research into the effects plastic pipes have on drinking water in eco-friendly green buildings in the United States. You should replace those pipes if you find more than 1 mg per liter of copper particles in your water. ", Writer: Emil Venere, 765-494-4709, venere@purdue.edu, Source: Andrew J. Whelton,(765) 494-2160, awhelton@purdue.edu, Release of Drinking Water Contaminants and Odor Impacts Caused by Green Building Cross-linked Polyethylene (PEX) Plumbing Systems, Keven M. Kelley 1, Alexandra C. Stenson 2, Rajarashi Dey 3, Andrew J. Whelton 4,*, 1 Department of Civil Engineering, University of South Alabama, 2 Department of Chemistry, University of South Alabama, 3 Department of Statistics and Mathematics, University of South Alabama, 4 Lyles School of Civil Engineering, Environmental and Ecological Engineering, Purdue University. It also cant tolerate temperatures greater than 140 degrees Fahrenheit. "The homeowners refused to take showers in the PEX-plumbed bathroom because they were concerned about their health.". Not all plastic pipes are safe. All Rights Reserved. When installing PEX piping as part of new construction, some states (such as California) mandate that contractors must flush the pipe system for at least two minutes, let the system stand for no less than one week, and then flush the system long enough to empty the contained volume of water. Easy Ways to Keep PEX Pipes From Freezing in Winter. Contractors began installing it about 35 years ago, with California last to approve its use; according to California State Pipe Trades Council, it wasnt until 2018 that California completed its review on the safety of PEX piping. This combination is very long-lasting and durable. Michigan also has an ETBE standard, but it is based on limiting drinking water odor caused by ETBE. Lets look at the most common types of materials used for household plumbing and why they may or not be a good fit for you. The product continues togrow in popularity, with reports showing an increase in PEX plumbing from 15% to 25% of all whole-home plumbing replacements from 2013 to 2015, respectively. Research with PEX pipes in the laboratory also showed that six brands caused drinking water to exceed the U.S. Environmental Protection Agency's maximum recommended drinking water odor limit, Whelton said. New Hampshire has the most stringent drinking water health standard of 40 ppb. It has a long lifespan, lasting for as long as 50 to 70 years, approximately 10 to 20 years longer than PEX piping. Plastic pipes, such as CPVC, and PEX are pipe materials that are safe for drinking water. However, while PEX pipes may not be entirely safe, these findings are still not definitive; studies did not account for factors like the types of fittings used to secure the piping, disinfection byproducts, and any synergistic effects. From what is known, preliminary findings show different PEX brands affect water quality differently, and even pipes that pass safety tests may contain enough contaminants to affect waters taste and smell. Copper is also much more expensive, as mentioned previously, costing nearly six times as much as PEX piping. Chlorine, the most popular disinfectant chemical used in the United States, protects drinking water from disease-causing organisms as it travels to the tap. Odors were not attributed to known odorants ethyl-tert-butyl ether (ETBE) or methyl-tert-butyl ether (MTBE). The gasoline smelling water was safe to use. Findings show some chemicals released by plumbing pipes can be transformed into carcinogenic chemicals regulated by the EPA; chemicals leached by certain plastics are conducive to bacterial growth; and plumbing system cleaning practices described in some, but not all, plumbing codes can cause PEX pipe chemical leaching to worsen. If you are working on a new construction project and need help with plumbing services, look no further than 535 Plumbing. The research, funded by the National Science Foundation, also is showing that there are differences in the quality of PEX products on the market, and different brands cause different odor and chemical-leaching impacts. Plastic pipes are generally less expensive, lighter and easier to install than metal pipes. In particular, you should look for copper pipes that have lead-free joint materials. Buildings are being plumbed with many types of plastic drinking water pipes. ETBE is a PEX pipe manufacturing byproduct with drinking water standards in New Hampshire and New York state. If your water has a pH value lower than seven, you may have to find a way to balance water acidity such as using a purifier. Green buildings are increasingly being plumbed with cross-linked polyethylene (PEX) potable water pipe. Copper, Easy New Construction Plumbing with 535 Plumbing. By testing tap water from the home, Whelton's team discovered that toluene, a solvent used for plastic resin synthesis and ETBE were present above levels where odors would be detected. Tap water quality was investigated at a six-month-old plumbing system and chemical and odor quality impacts of six PEX pipe brands were examined. Several types of plastic pipes in eco-friendly green buildings in the United States have been found to leach chemicals into drinking water that can cause odors and sometimes exist at levels that may exceed health standards. At 535 Plumbing, we take care of all your oahu plumbing needs for renovations, additions, and new construction. While the total mass of chemicals leached by PEX pipes was found to decline after 30 days of testing, odors generally continued as the pipes aged, Whelton said. Whelton). Here are some options for plastic pipes for safe drinking water: CPVC stands for chlorinated polyvinyl chloride.